What device measures flow rate to activate the chemical feed pump?

The flow sensor is the device specifically designed to measure the flow rate of a fluid in a system. It detects the amount of liquid passing through a certain point in the pipeline over a predefined period of time, converting this information into an electronic signal that can be used to monitor or control the flow rate. In the context of activating a chemical feed pump, accurate measurement of flow is crucial, as it ensures that the pump operates based on the actual requirements of the system. This allows for precise dosing of chemicals in various water treatment processes.

While a pressure gauge measures the pressure within a system and can provide some indirect information about flow, it does not measure flow rate directly. Similarly, a water meter primarily tracks the total volume of water that has passed through it but may not provide real-time flow rate measurements vital for activating a pump. A flow controller can regulate flow rates but is usually reliant on a flow sensor to provide the necessary data to make adjustments. Thus, the flow sensor stands out as the device directly tasked with measuring flow rate for the purpose of activating a chemical feed pump.